Preferential oxidation of CO in rich H2 over CuO/CeO2:: Details of selectivity and deactivation under the reactant stream

被引：180

作者：

Martinez-Arias, A.

Hungria, A. B.

Munuera, G.

Gamarra, D.

机构：

[1] CSIC, Inst Catalisis & Petr Quim, Madrid 28049, Spain

[2] Univ Seville, Dept Quim Inorgan, Seville 41092, Spain

来源：

APPLIED CATALYSIS B-ENVIRONMENTAL | 2006年 / 65卷 / 3-4期

关键词：

CuO catalyst; CeO2; CO-PROX; hydrogen; operando-DRIFTS; XPS; EPR;

D O I：

10.1016/j.apcatb.2006.02.003

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

A CuO/CeO2 catalyst is examined with respect to its performance for preferential oxidation of CO in H-2-rich streams. Catalytic activity results are explained on the basis of characterization by operando-DRIFFS and complemented with the analysis of redox properties by electron paramagnetic resonance (EPR) and X-ray photoelectron spectra (XPS). General catalytic activity features are accounted for by comparative analysis of the activities for individual CO and H-2 oxidation, for which similar CuO and CeO2 interfacial active sites appear to be involved. An interesting particularity is related to observation of a low temperature hydrogen oxidation process in which CO apparently acts as gaseous promoter. A deactivation process taking place rapidly under the reactant stream is evidenced and attributed to accumulation of hydroxyls on the interfacial active sites and/or to copper sintering in the course of the run. (c) 2006 Elsevier B.V. All rights reserved.

引用

页码：207 / 216

页数：10

共 37 条

[1] Influence of the preparation method on the performance of CuO-CeO2 catalysts for the selective oxidation of CO [J].